LXR linux/sound/soc/soc-cache.c

   1/*
   2 * soc-cache.c  --  ASoC register cache helpers
   3 *
   4 * Copyright 2009 Wolfson Microelectronics PLC.
   5 *
   6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7 *
   8 *  This program is free software; you can redistribute  it and/or modify it
   9 *  under  the terms of  the GNU General  Public License as published by the
  10 *  Free Software Foundation;  either version 2 of the  License, or (at your
  11 *  option) any later version.
  12 */
  13
  14#include <sound/soc.h>
  15#include <linux/export.h>
  16#include <linux/slab.h>
  17
  18int snd_soc_cache_init(struct snd_soc_codec *codec)
  19{
  20        const struct snd_soc_codec_driver *codec_drv = codec->driver;
  21        size_t reg_size;
  22
  23        reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
  24
  25        if (!reg_size)
  26                return 0;
  27
  28        dev_dbg(codec->dev, "ASoC: Initializing cache for %s codec\n",
  29                                codec->component.name);
  30
  31        if (codec_drv->reg_cache_default)
  32                codec->reg_cache = kmemdup(codec_drv->reg_cache_default,
  33                                           reg_size, GFP_KERNEL);
  34        else
  35                codec->reg_cache = kzalloc(reg_size, GFP_KERNEL);
  36        if (!codec->reg_cache)
  37                return -ENOMEM;
  38
  39        return 0;
  40}
  41
  42/*
  43 * NOTE: keep in mind that this function might be called
  44 * multiple times.
  45 */
  46int snd_soc_cache_exit(struct snd_soc_codec *codec)
  47{
  48        dev_dbg(codec->dev, "ASoC: Destroying cache for %s codec\n",
  49                        codec->component.name);
  50        kfree(codec->reg_cache);
  51        codec->reg_cache = NULL;
  52        return 0;
  53}
  54